Attachment plug



lG. B. WEBER ATTACHMENT PLUG Filed Hay 28. 1920 r W/ VIII/4394 Patented Dec. 8, 1925.` y

i GEAELE B. WEBEE, 0E cniciico, innincisgnssiGNcn To BENJAMIN EnE'ctfiEic MANU- EAcTUEiNejcoMnn-NY, onciiicnco, ILLINOIS, A .COEPOEATIQMOE ILLINOiSL- ATTACHMENT' PLUG.' f

iippiication mea May 2s, 1920; semi masfifsei.y

To all whom if may/concern.'

Be it known that I, GRABLE B: yWEBER, .a 1 citizen of the UnitedStates, residing ateChicontrcllinglevce .19 ,mounted in, thefllsw cago, in the county-of Cook andrStateo 5 lllinois, have invented new and useful I mprovements in Attachment Plugs, of which thc-following is a full, clear,rcloncise,and eX- act description, referencebeing hadtoytlie accompanying drawing, forming. a thisl specification.

lVIy invention. relates to 'liasto be made to prevent injurytothe con- Vta-ct- ,due to l`the vheayy cuirent.

Whichprouision is made-for preventinginjury to' the contactand making thefconnecti on.'; lfV accomplishjthi's by! `lproyidingy a switchl rii'iechanism carried gby: the pluggr which switch mechanism isautomaticallyu Y moved to '-fon position? when .the p'lugis in.v

sented into the iieceptaclei l Further Qbjectswill-appear from` the Adescription to follow andfromthe cl'aiinsffV In the drawings, in' which an embodiment Vof invention 'i's'shoWn-f I l ,is .an aQX-,ialgksectioni ofI an' attachment plug on the line `1--1 of'Fig. 2;"

. Fig/3 is a section onthe sameiplaneas ligl butshowing the center` contact-switch piishediin; and l l Fig. sa sideelevationofapart of the` plug with the .threadedl-shellcontact removed. n

In order to giye a general'idea of the cc1istruction shown, it 'isliere stated that it comthe plug' being? provided with a thuiiibpiece or handlennembe'r, the, plug. itself 'cQnta'fi-ning :a switch mechanismlor circuit controller-acfAv 4tuated bythe centercontact-ofthe-plug, and 'being Aprovided lwith binding ltei'ifiiinals'i `for ,ccrdgrip means I forY relieving tli'es'eblinding conductors.

Referringiiow to the, construction in' Avdeil l v Wi-lfll` be moved' to ifa? position shown "Fig. 3, `4and the conical cam Iface"'c i'fftli'e enlargement tail, tlie'plug'shxown coinpiisesfaii insulating .part-fofv attachment plugs, and morespeciicallyA toattachi'nent; plugs for vheavy duty, in Awhich :provision lower end `of theshank 27 but also to secure `termiiifails' from stifinedu'e to olii-the ciwhandleT 18 connected withthe swyel Shell;

coi'itafctv 17, a switch mechanism ,oi-l; circuit-y lating hase; 15.., bindiigtcrminals 2.@ :aI-1d' .21

for the ,conductors leadingi-iom the plugfi'e- -spectively,'and an insulating 4*screw cord-,grip

niembei for gripping the*` conductors .to

strain.;

:Referring struction offthe switch-mechanism .orI circuitcontiiolling 4mechanism 19j, thisecomprises-fan :relieve the binding terminals 20ind21- f10m `PeI'ticularly. .nowto :thwon-f i insulating. pu'shbuttOn member- 23, "VvhlilnlV S -slidably inoiintedsiii theJ Vinsulating' hasefl,

and; carries the centerl contact 116,a V*pair-'fof movablev spring contact? imcmbers 24, 1. actuf ated1by the push button- Iiiernbeit 5 23,; and, Van

. annular'w contact member7 `25-fwith respect to which ,the contact y.members:24` .are moi/led intoj and? cuty ofi lengagement.fl The annular 'l `contact memberf ;,.has-f` formed-y integral. l

' therewith. ,the downward extension 1126, into v which the binding screw fof. the-ibindingfterfor the lower. end of: thisshank 2' 3". it: maybe thev Contact members. 24: vare Aalsfoi" lfoinied.l This; eyelet thus, serves not only .to guide'fthe :button/23j.. IIn oideiitoiprovide uideemeansj the-contact fingers 24-iniplace ."This reyelet'r poirtion -is secured to anf insulating;` discfi29,

hase-15. i

1 coil compression spring'SOfisprovidedwli1ch=fnoifmally= holds fthe plunger 23 and lcontact 16- inl extended position.'v This plunger 23 is provided with' an annulail'en- Vla rgement 81,' the-lower face ofl v*which 'forms 'a'fconi'calfcam *for cooperation withA the spring Contact ngeisfQl-s When `tlfief'plug l isfnotA connectechfthe coil ccmp-ressien?sp'ringV L sition, and 'the spring contact-fingers gfiwill thnffbe in' the posirtnf'shqwn 'in Fig. i.`

which in turn is. secured tothe insulating lmember 32,1101; only l'serves to electricallyl connectfthe'threaded shell contact with the` out of engagement with the annular contact lmember and thus complete the circuit bev tween the center contact 16 and the binding binding terminal 21, but also serves to hold the 'insulating disc 29 in place on the insu-V lating base 15. Furthermore, the sliding 'contact member 32 is formed as an integral -part of a stamping which has a downwardly extending screw-threaded portion 37 into Vwhichthe cord-grip member 22 is threaded. The insulating disc 29 is provided with a pair of openings 3S through which the con- Vductors are led respectively, the conductors being pinched or gripped between the up-. per edge of the cord-grip 'member 22 and the edges of the openings 38, when the cord-grip :threaded collar 37.

In wiring the device, thev cord-grip inem- Vber 22 is unscrewed from the threaded collar 37, the threaded contact 17 is slipped ydownoff from the insulatingr base 15, the cord-'grip member 22 and the threaded shell ycontact 17 are passed over the ends of the conductorsyaiid 'the conductors are passed up through theopenings 38 and secured to to grip the cord and also to hold the thread--v the binding terminals 2O andv 21 respectively.V The" threaded shell contact 17 is then slipped up in place on the insulating base 15 and the cord-grip'member 22 is screwed up ed shell contact 17 in place.

Assuming that the plugis screwed into the socketand that the parts are therefore ina position shown in Fig. 3, the circuit isV from the center Contact, through the e shank portion 17, the eyelet portion 28, the

vco

spring contact iingers24, the annular contact 25 and binding terminal 2O through whatever translating device is connected with the plug to the binding terminal 21 thence through the sliding contact 32 to Vfthe threaded shell contact 17.

l The manner in which the circuit controller is operated has been outlined in connection `with'the description of the construction and is as follows: Then the threaded shell contact 17 is'screwed into a socket, the center contact 16'is thereby brought intoV engage-' ,ment with the .centencontact of ,the socket,

member 22 is screwedinto the Y but as the spring Contact: fingers 2e are not yet in engagement with the annular contact 25 there will be no current flowing. However, after the threadedshell contact is screwed in further, the center contact 1G and plunger 23V are moved inwardly with respect to the insulating base 15, and the cam portion of the enlarge-ment 31 of the switch button will force the contact lingers 2l outwardly into engagement Vwith annular contact 25 andthus complete the circuit. This prevents any` arcing between the contacts .of the plug and the contacts of the receptacle.k Y Y VSimilarlywhen the plug is removed from thefsocket, the coil compression spring 30 will keep the center Contact 16 of the plug in engagement with the Vcenter vcontact of the receptacle until after the plunger 23 has i been moved'outwardly to permit the spring Contact fingers V24 to move away from engagement with the annular contact member 25. The circuit is therefore not broken between the plug contact and the receptacle contact but between the contacts which are located inside the insulating base 15. rlhus there is no danger of arcing between the plug contact and the receptacle contact.

' Having thus described my invention, what e I claim ask new and desire to secure by Letters Patent is: I

1. An attachment plug comprising a body portion, a disc thereon, a Contact member within said bo'dy, an eyelet in said disc, a-

contact finger secured to said disc by said eyelet, and means for causing said contact finger to engage said contactmember com prising a plungerextending through said body portion and slidable in said eyelet.

2. AnV attachment plug comprising a body portion1 a disc thereon having. an opening` therein, a plunger extending through said n bo'dy portion, a center` contact. on said plunger having a shank thereon guided in said opening, andl a vcontact finger supported by said disc, and means whereby said contact finger is controlled by said plunger.V

, 3. A switch plug comprising an insulating base, a center contact member mounted for longitudinal movement thereon, a shell rcontact member swiveled therein, a wiring terminal provided with a contact member slidably engaged by said swivel shell, a second .wiring terminal provided with a contact member and switch mechanism comprising a contact movably mounted on lsaid insulating basey andY operated by said center contact for controlling the circuit between said center contact and the contact with which said second wiring terminal is provided.

4f. A switch plug comprising an insulating base, a center contact member mounted for longitudinal movement thereon, a shell contact member `swiveled therein, .a wiring terminal provide'd with a contact member ing a contact movably mounted on said Vinv sulating base and operated by said center contact for controlling the circuit between said center Contact and the contact VWith which said second Wiring terminal is provided, said movable contact comprising an elongated member extending longitudinally o't the plug and swingable back and forth to engage and disengage the contact for the second wiring terminal.

5. A switch plug comprising an insulating base, a vshell contact mounted therein, a renter Contact mounted for longitudinal movement thereon, Wiring terminals mounted thereon for said contacts, respectively, and means for controlling the circuit between one of said Wiring terminals an'd one of said contacts comprising an elongated; contact vmember located substantially Within saidV threaded shell contact and Vextending longi tudinally of the plug andswingable back and forth by means cfa center contact.

6. A switch plug comprising an insulating 4 base, ashell contact mounted thereon, sai

base having a central recess thereon and an i opening at its entering endleading to said recess, a center contact member slidably mounted in saidopening, and switch'mecha nism for controlling the plug circuit, said switch mechanism ycompris'mg a member located substantially Within saidV threaded v shell contact and mounted to swing back and forth in said recess` and operated by saidv Y slidable lcenter ,contact member. A Y

In witness whereof, I have hereunto sub# scribed my name. Y 1

GRABLE B; WEBER.V 

